The grafts can fall out as soon as day 10 and the fallout can continue up to several months. It is important to assess how much has fallen out and what type of hair transplant you had i.e FUE or FUT. Many factors play a role in the fall out and it can be normal.
It’s rare to have grafts coming out after ten days. You should schedule a follow up with your doctor to see if it’s the hair,scab or actual follicle that came out.